Optical memory system for a reading/writing, verifying and track

Details Optical memory system for a reading/writing, verifying and track Optical memory system for a reading/writing, verifying and track

1981-01-08

1984-08-14

Stellar, George G.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369121, G11B 712

Patent

active

044660871

ABSTRACT:
A single semiconductor laser (10) is utilized in an optical system (2) to record and readback from a recording media such as a spinning disk (24). By means of a retro-reflecting light and optical system, the same optical path can be used not only for recording, but for readback of the recorded data on the recording media (24). A polarizing beam splitter (16) causes the light beam (8) to pass through an optical system whereby both focus error and tracking error as well as the data signal can be generated. By dithering the light beam across the recorded track in accordance with data signal, a tracking error signal is generated to cause the dithering motion of the galvanometer (20) to maintain its center tracking of the recorded information. By the use of a separate beam splitter (30), a focus error signal can be detected by means of error signals from complementary detectors S1, S2 to maintain accurate focus of the applied light beam on the recording media.

REFERENCES:
patent: 3991275 (1976-11-01), Bulthais
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4118735 (1978-10-01), Wilkinson
patent: 4241423 (1980-12-01), Burke et al.
patent: 4290122 (1981-09-01), Bates et al.
patent: 4334299 (1982-06-01), Komurasaki et al.
Spie vol. 222 Laser Scanning and Recording for Advanced Image and Data Handling (1980) pp. 128-135 (Sep. 10, 1980).
Archival Optical Disk Data Storage, G. J. Ammon.

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